nc: bad address 'elasticsearch'

When trying to `docker-compose run` according to the initial instruction setup.

I even tried adding elasticsearch to `/etc/hosts` for 127.0.0.1, but that didn't help either. Looks like it's actually a setting from within one of the instances?

For reference, I took a fresh AWS EC Linux 2 instance and:
```
sudo yum update
sudo yum install git
sudo yum install docker
sudo curl -L https://github.com/docker/compose/releases/download/1.21.0/docker-compose-$(uname -s)-$(uname -m) -o /usr/local/bin/docker-compose
git clone https://github.com/dutchcoders/slackarchive-docker
cd slackarchive-docker #STEP IS MISSING FROM INSTRUCTIONS
cp slackarchive/config.yaml.sample slackarchive/config.yaml
cp slackarchive-bot/config.yaml.sample slackarchive-bot/config.yaml
vi -p */config.yaml #made up random values for bot: token that matched api-token updated tokens to contain the xoxp legacy slack token, changed the password for MONGO_INITDB_ROOT_PASSWORD though it's not clear if it needs to be changed elsewhere? made up random values for cookies: authentication_key and encryption_key
sudo service docker start #not in instructions, but possibly OS specific
sudo docker network create slackarchive
sudo /usr/local/bin/docker-compose run --rm wait_f_dependencies #where error occurs
```